If you're ever in Upstate South Carolina, like halfway between Charlotte and Atlanta--and I can't think of why you would be, but humor me--check out the Stumphouse Mountain Tunnel. It was a planned tunnel for the Confederate Railroad through the foothills of the Smoky Mountains, but they never finished the tunnel. No ladders or manholes--you just walk on in. You can bring a flashlight, but it's delightfully eerie to try and hike it using just a glowtube. There's also awesome mountain hiking all around the outside, and a gorgeous waterfall.
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If you're ever in Upstate South Carolina, like halfway between Charlotte and Atlanta--and I can't think of why you would be, but humor me--check out the Stumphouse Mountain Tunnel. It was a planned tunnel for the Confederate Railroad through the foothills of the Smoky Mountains, but they never finished the tunnel. No ladders or manholes--you just walk on in. You can bring a flashlight, but it's delightfully eerie to try and hike it using just a glowtube. There's also awesome mountain hiking all around the outside, and a gorgeous waterfall.